Why is a story more than simply the sum of its parts (including plot, theme, tone, point of view, and voice)? Also, why is it useful to look at each of these parts individually?

Mr. amoroso is worried about jerri, a girl who is struggling in his seventh-grade class. he thinks about several different reasons why she might be having so much difficulty with her schoolwork. which one of the reasons he considers is consistent with a behaviorist perspective of learning?